Mike calling those kids "millennials."

First these are all market research categories in the US. They don't have an agreed age category. Some would label millennials to only 1984, others 1981, while some even 1977. And even then, all these supposed shared characteristics are all American characteristics that many outside of the US do not share.

2nd, gen y has been in use since the 90s to refer to the teenagers of that generation who grew up using computers. Millennials only came in later in the late 00s to specifically refer to those who are still in school by 2000, so some would have the cut off at highschool while other market researchers would have it at college.

Finally all you did was copy/paste from an article, I can also do that but it doesn't change the fact the gen y and millenials are not the same thing. Gen y was used far earlier and referred to an earlier age group that can either be a late gen x, millennial, or even a cusper.

Quote:
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The birth years for Millennials are a hot topic and one in which there is much debate. Based on The Center’s research, we place the birth years for Millennials from approximately 1977 to 1995 in North America.

I emphasize approximately because the ending of one generation and beginning of the next is almost always a transitional period of a few years, not one defining moment—except in the case of 9/11 in the U.S.

Since 9/11 was such a generation-defining moment in the U.S., Millennials end in 1995 and Gen Z begins immediately afterward. If you were born after 1995, our research shows it’s almost impossible to clearly remember 9/11 and have a deeply emotional, life-changing connection to it.

Another way I explain it in my speeches and writing is, “If 9/11 has always been history to you—and not something you personally remember—then you are not a Millennial; you are Gen Z.”
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^^^This doesn't even apply to those outside of the US unfamiliar to 911. In the end, this is all just made up with no consensus even, so who cares?